Find particular string from URL in JavaScript

You could use the indexOf method:

url.indexOf('myurl.com')

if the result is greater than -1, then myurl.com is contained in the url.

Please try the following demo

var array = ['staging.myurl.com', 
             'dev.myurl.com', 
             'qa.myurl.com', 
             'r1.random.com',
             'fake.domain.com'];

// The last two items in the array will not be shwon in the alert.

var desiredUrls = [];

for(var i=0; i<array.length; i++)
   if(array[i].indexOf('myurl.com')>-1)
     desiredUrls.push(array[i]);

alert(desiredUrls);

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